Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	$ (31,615)	$ (14,683)	$ (20,625)	$ (15,832)
Unrealized Gains (Losses)	4,000	2,234	(1,837)	5,044
Income Tax Effect - Benefit/(Expense)	(296)	(60)	(226)	39
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	11,956	309	(188)	1,499
Realized (Gains) - Investment Securities	2,908	(152)	4,339	(218)
Income Tax Effect - (Benefit)/Expense	(370)	30	(647)	55
Net Of Tax	2,538	(122)	3,692	(163)
Net current-period other comprehensive income/(loss)	14,494	187	3,504	1,336
Balance, End Of Period	(17,121)	(14,496)	(17,121)	(14,496)
Unrealized Gains/Losses On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	1,309	(80)	2,198	(2,948)
Unrealized Gains (Losses)	(820)	2,095	(2,894)	4,905
Income Tax Effect - Benefit/(Expense)	(186)	(60)	(116)	39
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,006)	2,035	(3,010)	4,944
Realized (Gains) - Investment Securities	1,854	(147)	3,246	(213)
Income Tax Effect - (Benefit)/Expense	(370)	30	(647)	55
Net Of Tax	1,484	(117)	2,599	(158)
Net current-period other comprehensive income/(loss)	478	1,918	(411)	4,786
Balance, End Of Period	1,787	1,838	1,787	1,838
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	(3,724)	0	0	0
Unrealized Gains (Losses)	4,820	139	1,057	139
Income Tax Effect - Benefit/(Expense)	(110)	0	(110)	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,710	139	947	139
Realized (Gains) - Investment Securities	1,054	(5)	1,093	(5)
Net Of Tax	1,054	(5)	1,093	(5)
Net current-period other comprehensive income/(loss)	5,764	134	2,040	134
Balance, End Of Period	2,040	134	2,040	134
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	(29,200)	(14,603)	(22,823)	(12,884)
Unrealized Gains (Losses)	8,252	(1,865)	1,875	(3,584)
Income Tax Effect - Benefit/(Expense)	0	0	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	8,252	(1,865)	1,875	(3,584)
Net current-period other comprehensive income/(loss)	8,252	(1,865)	1,875	(3,584)
Balance, End Of Period	$ (20,948)	$ (16,468)	$ (20,948)	$ (16,468)